Chicago Left Turn Traffic Calming Reduces Crashes

The city installed reflective posts and speed bumps at dangerous intersections to induce drivers to take left turns more slowly and carefully.

1 minute read

January 24, 2023, 7:00 AM PST

By Diana Ionescu @aworkoffiction


Crosswalk in Chicago with newly installed yellow delineators and speed bumps

City of Chicago / Left turn traffic calming

A traffic calming element installed at 18 Chicago intersections is successfully slowing left turns, reducing the risk of collisions with pedestrians, reports Monica Eng in Axios. The project is part of the city’s efforts to reach its Vision Zero goals and eliminate pedestrian deaths. 

According to Eng, “Left turns were involved in 40% of crashes that led to serious injury or death from 2017 to 2021, according to city data.” David Smith, the city’s Complete Streets director, says data from a pilot program shows a 25 percent reduction in crashes at intersections where the change was made.

Some residents expressed frustration with the new infrastructure, inadvertently proving the device’s efficacy: “All they have done is further slow traffic,” one NextDoor commenter complained. Which is, after all, the point. “If you hit a speed bump or the rubber posts, you've driven in the wrong place.”

Friday, January 20, 2023 in Axios

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

High-rise apartment buildings in Waikiki, Hawaii with steep green mountains in background.

Study: Maui’s Plan to Convert Vacation Rentals to Long-Term Housing Could Cause Nearly $1 Billion Economic Loss

The plan would reduce visitor accommodation by 25,% resulting in 1,900 jobs lost.

April 6, 2025 - Honolulu Civil Beat

Two yellow and white Dallas Area Rapid Transit light rail streetcars at station in Dallas, Texas.

North Texas Transit Leaders Tout Benefits of TOD for Growing Region

At a summit focused on transit-oriented development, policymakers discussed how North Texas’ expanded light rail system can serve as a tool for economic growth.

April 3, 2025 - KERA News

Blue and white Seattle Link light rail train exiting concrete Downtown Bellevue Tunnel in Bellevue, WA.

Why Should We Subsidize Public Transportation?

Many public transit agencies face financial stress due to rising costs, declining fare revenue, and declining subsidies. Transit advocates must provide a strong business case for increasing public transit funding.

April 7, 2025 - Todd Litman

Amtrak Acela

How to Make US Trains Faster

Changes to boarding platforms and a switch to electric trains could improve U.S. passenger rail service without the added cost of high-speed rail.

April 11 - Bloomberg CityLab

Mural showing tools and craft supplies with banner reading 'Things are made here' in front of makerspace in Columbia, Missouri.

Columbia’s Revitalized ‘Loop’ Is a Hub for Local Entrepreneurs

A focus on small businesses is helping a commercial corridor in Columbia, Missouri thrive.

April 11 - Next City

Close-up of wood log with emerald ash borer larvae tracks etched in the wood.

Invasive Insect Threatens Minnesota’s Ash Forests

The Emerald Ash Borer is a rapidly spreading invasive pest threatening Minnesota’s ash trees, and homeowners are encouraged to plant diverse replacement species, avoid moving ash firewood, and monitor for signs of infestation.

April 11 - The Bemidji Pioneer